where \(\hat{\cal A}_{A,B,C}\)  have the same formal expression as
\({\cal A}_{A,B,C}\)  [1]} with the replacement [2]}
\(V^{^1S_0}_{\nu \, {\rm L}} ({\mathbf {q}}) \ \rightarrow \ V^{^1S_0}_{\bar{O}_{LR}} ({\mathbf {q}}) \ =\frac{1}{2} \, g_A^2 \, g_{LR}^{\pi \pi } \ \frac{ {\mathbf {q}}^2}{({\mathbf {q}}^2 + M_\pi ^2)^2}\,,\) 
